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Gen. Joseph Votel, the top U.S. commander for the Middle East, right, gets a briefing on the USS Nimitz, from Lt. Cmdr. Vern Jensen, the aircraft handling officer for the ship, Thursday, Aug. 24, 2017. The Nimitz is in the Persian Gulf, and fighter jets are flying off the aircraft to conduct strikes in Iraq and Syria.

High above the Persian Gulf, an Iranian drone crosses the path of American fighter jets lining up to land on the USS Nimitz.

The drone buzzes across the sky more than a mile above the massive aircraft carrier and is spotted by the fighters. It is unarmed.

But for the senior Navy commanders on the ship, the presence of the enemy drone so close is worrying. Their biggest fear is the surveillance aircraft will start carrying weapons, posing a more direct threat to U.S. vessels transiting one of the world's most significant strategic and economic international waterways.

"It's just a matter of time before we see that," said Navy Rear Adm. Bill Byrne, commander of the carrier strike group that includes the Nimitz. He said the Iranian drone activity has "generated a lot of discussion" and was becoming an increasingly pressing matter of concern.

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If, at some point, Byrne believes a drone is threatening his ship, he and his staff would have to carefully proceed through the required responses — efforts at communication, sounding the horn, firing flares and warning shots, and flying a helicopter close to the unmanned vehicle. If all those efforts fail and he still perceives a threat, Byrne said it would be his duty, his "responsibility," to shoot down the Iranian drone.

So far, it hasn't come to that. But the drones have become an even more dangerous security risk as U.S. carriers in the Persian Gulf like the Nimitz play a key role in Iraq and Syria. Planes from these ships are regularly flying to each country to bomb militants fighting with the Islamic State group and other targets. From the Nimitz alone, U.S. fighter jets flew missions resulting in at least 350 bombs being dropped on IS militants just in the last month.

Iran has routinely challenged U.S. ships and aircraft across the Gulf, asserting at times that the entire waterway is its territory. Navy commanders say Iran's unpredictable behavior is the biggest safety hazard.

"Iranians don't always follow the rules," Byrne said. "There is a well-established set of norms, standards and laws. They don't tend to follow them."

To counter the threat, Pentagon experts are searching for new ways to deter, defeat or disable the drones. According to Byrne and Cdr. Dave Kurtz, the Nimitz's executive officer, Iranian drones fly over the carrier strike group almost daily.

They said the danger is that as the F/A-18 fighters return from their missions in Iraq and Syria, they circle overhead, lining up for their turn to land on the carrier. Even if the Iranian drones are only meant to annoy, their buzzing across the American flight paths risks an accident.

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Up in the carrier's control room, a book on Iranian naval and maritime forces sits above the radar screen. Commanders on the ship announce when a drone appears. Then, they go through a careful, planned response of attempted radio calls and warnings.

Gen. Joseph Votel, the top U.S. commander in the Middle East, visited the Nimitz on Thursday, also stopping on the nearby USS Vella Gulf, a guided missile cruiser. The drone, he said, also flew over that ship.

"The proliferation of drones is a real challenge," said Votel, who was finishing his 10-day trip to the Middle East and Afghanistan. "It's growing exponentially."

Speaking with traveling reporters, Votel said the Pentagon has sought to devise more high-tech ways to handle the drones through the Joint Improvised-Threat Defeat Organization, originally set up in 2006 to counter improvised explosive devices used by insurgents in Iraq and Afghanistan to kill and maim American troops.

Much as it did with that decade-old roadside bomb battle, the organization now focuses on how to deal with Iran's drones, Votel said. He didn't provide details, but he acknowledged that U.S. cyber capabilities could be used to defeat a drone or the network controlling it.

The military is training troops on drone response, he said. But right now, said Byrne, they're still following their normal procedures. And he still hasn't been forced to shoot one down.

Byrne described how a helicopter from the Nimitz flew by the drone to ensure it wasn't weaponized. In the month the Nimitz has been in the Gulf, efforts to speak with the drone operators have been hit or miss, he said.

"Sometimes they answer, sometimes they don't," he said, echoing experiences American forces have had with small Iranian fast boats that pose a similar threat of coming too close by sea.

When the Iranians do answer, Byrne said, they often "challenge our assertion that they are flying into danger." The drones fly out of airfields up and down the Iranian coast, mainly watching U.S. ships and taking photos.